Composition of matter.



UNITED STATES PATENT OFFICE.

JOSEPH RUSSELL CORNELL MARSH, OF CINCINNATI, OHIO, ASSIGNOR TO lvIARSl-I STEEL COMPANY, OF CINCINNATI, OHIO, A CORPORATION OF OHIO.

COMPOSITION OF MATTER.

No Drawing.

To all whom it may concern Be it known that I. JosEPH R. C. MAnsH, a citizen of the United States, and a resident of Cincinnati in the county of Hamilton and State of Ohio, have invented a new and useful Improvement in a Composition of Matter, of which the following is a specification.

My invention relates to compositions of matter for treating cast iron and steel in the ladle, crucible or any other suitable retainer, and it consists in the chemical mixture here inafter described.

An object of my invent-ion is to provide a substance for treating metal in the ladle or crucible which will impart to the metal certain qualities that are ordinarily attained only by subsequent treatment.

Thus it is my object to increase the toughness of the metal, to add to its strength, to give it a finer grain, to remove objectionable substances, such as phosphorus, sulfur, etc, and in short to make of the iron or steel a better product than that which usually com es from the ladle or crucible.

Other objects and advantages will appear in the following specification.

In carrying out my invention I provide a chemical mixture with which the metal is treated while in a molten state, and which acts on the metal in the manner hereinafter described. This mixture is composed of form-manganese, ferro-silicon, chromium, copper, boron and arsenic in one form or another. Thus I may use ferro-manganese, ferro-silicon, sesquioxid of chromium, ferrochromium or a copper compound of chromium, White arsenic oxid or any other form of arsenic, boric acid or borax. Vith the metals mentioned above I use metallic cop per.

As an example of the chemical mixture which gives good results I may cite the following: ferro-manganese 1%, ferro-silicon 1%, metallic copper 1.50%, chromium 50%, boric acid 20% and arsenic oxid 20%. This table gives the per cent. of the weight of each ingredient as compared with the total Weight of the metal to be treated.

In the case of cast iron a definite portion of the mixture is placed in the ladle and the Specification of Letters Patent.

Application filed December 15, 1911.

Patented May 28,1912.

Serial No. 665,973.

molten metal is poured on it. The ladle is held for three or four minutes to give the chemicals a chance to act. In the case of cast steel the molten steel is held from five to ten minutes before pouring. The action of the chemicals tends to raise the heat slightly so that the metals will pour easily. During the treatment certain objectionable substances, such as sulfur, phosphorus, etc., are removed.

Cast iron produced by this process has the following properties :-The iron is harder and the grain finer. The metal has a greater elastic limit and a greater tensile strength. Both the iron and steel are hot hard, e., they retain their rigid form at high temperatures and in this respect resemble high speed steel. They also take a high polish.

The temperature at which the metals are cast is that for the ordinary casting purposes, but if the metals are to be quenched after casting care should be taken in regulating the temperature of the metal. Thus it should not be carried much beyond 1325 Fahrenheit. Steel castings will always be found to be better when heated after casting and then quenched, especially so when high elastic limit and tensile strength are required.

It will be obvious, from what has been stated that other ingredients than those given in the example may be used. The pro portions also may be varied within limits in accordance with the metal to be treated.

I claim 1. The herein described composition of matter for treating cast iron and steel which consists in a chemical mixture containing manganese, silicon, copper, chromium, boron, and arsenic.

2. The herein described composition of matter for treating cast iron and steel which consists in a chemical mixture containing ferro-manganese, ferro-silicon, metallic copper, chromium sesquioxid, boric acid and arsenic oxid.

JOSEPH RUSSELL CORNELL MARSH.

I Vitnesses JOHN IV. MATTHEWS, N. S. I-ImLBoRNn.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

